A research team used a long-term mouse model to recreate the repeated drops in oxygen that occur in human obstructive sleep apnea. The mice were exposed to intermittent hypoxia during the hours that match normal mouse sleep and then were followed across their lifespan.
Compared with animals kept in normal oxygen, mice with prolonged intermittent hypoxia showed higher mortality and clear signs of faster cardiovascular aging. The study reported higher blood pressure, worse heart function, less flexible blood vessels, reduced coronary flow reserve, and abnormal heart electrical activity.
The authors say chronic stress from untreated sleep apnea changes heart structure and function and can shorten life. They recommend early screening and treatments such as CPAP therapy to protect long-term heart health.
Difficult words
- hypoxia — low amount of oxygen in the bodyintermittent hypoxia
- lifespan — the length of time a living thing lives
- mortality — the number of deaths in a group
- cardiovascular — relating to the heart and blood vessels
- coronary flow reserve — how much blood flow the heart can increase
- screening — a test to find a disease early
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- Do you think people should have early screening for sleep apnea? Why or why not?
- How might sleep problems affect a person’s heart health?
- Would you use a treatment like CPAP if a doctor recommended it? Why or why not?
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